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Re: [Committed PATCH] Re: cc-mode fontification feels random

From: Alan Mackenzie
Subject: Re: [Committed PATCH] Re: cc-mode fontification feels random
Date: Fri, 22 Oct 2021 20:13:25 +0000

Hello, Stefan.

On Tue, Aug 31, 2021 at 21:17:12 +0000, Alan Mackenzie wrote:
> On Tue, Aug 31, 2021 at 14:56:13 -0400, Stefan Monnier wrote:
> > > So, it seems I want something like stealth, but not quite.  How about,
> > > say jit-lock-single-fontification - it would apply to individual buffers
> > > only, would scan through the buffer precisely once, and would do just
> > > enough 500-byte chunks at at time to take 0.05 seconds (configurable).

[ .... ]

> It is the incorrectness of the display of some CC Mode types, rather
> than the speed of fontification which is the issue here.

[ .... ]

> It may be busy, but it remains responsive, as in stealth fontification.
> Is this really a problem, as long as one's running on mains power, not a
> battery.

> > For my own use, the benefit of "correct" highlighting of types is not
> > worth any effort at all.

> I envisage this facility being enabled by a user option.

Indeed, though the option is "opt out" rather than "opt in".  This
facility is only active for a few seconds after initialising a CC Mode

[ .... ]

> > .... but if so I think you'd be better off running an ad-hoc timer
> > that does nothing else than scan for type declarations (without doing
> > the rest of font-lock).  It'll be faster and you won't need to care
> > about what jit-lock does.

> Thanks, that's a brilliant idea!  It will be somewhat faster rather than
> much faster (because parsing declarations is what sucks up the time in
> CC Mode's fontification), but as you say, assuming most parts of most
> buffers never get displayed, it will be a net win.

> It will be more work to code up, though.  I'm currently quite some way
> into hacking up jit-lock-single-fontification, so I'm going to get that
> working first to see how well it works.

I never finished this.  It doesn't matter any more.

> Then I'll hack up your idea, and confirm it works better.

Well, I've coded it up and committed it to master.  The fontification of
CC Mode types should now be somewhat less random than previously.

> >         Stefan

Alan Mackenzie (Nuremberg, Germany).

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